Synthesis and characterization of B-type Anderson polyoxoanions supported copper complexes with mixed ligands

Two novel compounds constructed by Anderson-type polyoxoanions and copper complexes with mixed ligands, (H3O+)[Cu(C6NO2H4)(phen)(H2O)](2)[Al(OH)(6)Mo6O18]center dot 5H(2)O (1) and (H3O+)[Cu (C6NO2H4)(phen)-(H2O)](2)[Cr(OH)(6)Mo6O18]center dot 5H(2)O (2) have been isolated by conventional solution method, and characterized by elemental analyses, IR spectra, thermal stability analyses, X-ray powder diffraction and single-crystal X-ray diffraction. Compounds I and 2 are isomorphic and reveal an example of three-dimensional supramolecular organic-inorganic hybrids based on copper complexes with mixed 1,10-phenanthroline and pyridine-4-carboxylic acid ligands supported on Anderson-type polyoxoanions. Furthermore, both of the compounds exhibit photoluminescent properties at ambient temperature, and to elucidate the electronic properties of the metal ions (Cu2+ or Cu2+/Cr3+), EPR studies have been performed, and the results are in good agreement with the structural feature of these compounds. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved.